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Finding the Fourth Proportional to 1,121.91, 1,548.27 and 702.13

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Solution

The fourth proportional to 1,121.91, 1,548.27 and 702.13 is: 968.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.91 : 1,548.27 = 702.13 : x
  2. Step 2: Convert to fraction form
    1,121.91/1,548.27 = 702.13/x
  3. Step 3: Cross multiply
    1,121.91x = 1,548.27 × 702.13
  4. Step 4: Simplify right side
    1,121.91x = 1,087,075.56
  5. Step 5: Solve for x
    x = 1,087,075.56/1,121.91
  6. Step 6: Final answer
    x = 968.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.